why can't is access a destination server using robocopy

I am trying to use robocopy to copy files and directories from a windows 2003 server to a windows 2012 server. I continue to get error 5 saying it cannot access the destination directory...i have checked all permissions and shares and they seem to be correct....i am logged on as a domain administrator and both machines are in the domain.....any thoughts?

here is the command : ROBOCOPY "\\sourceserver\humanresources" "\\destinationserver\shares" /MIR /COPYALL /LOG:TEST /N
XCOPY seemed to work without those arguments, but I wanted to bring over the security permissions

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if the xcopy works, I assume the share permissions are good.
That leave as potential problems:
Attempted delete of file in use (caused by /MIR)
Attempted delete of file with no permissions (also caused by /MIR)
Try it witouth /mir then is successful, check for open file and check that administrator has all right needed for deletion on every file/folder in target

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